JP5032058B2 - Installation method of wave-dissipating block - Google Patents

Description

The present invention may be installed to prevent erosion to or corner of the river bank protection, also it relates to method of installing wave dissipating blocks that can be used to reduce the damage caused by the tsunami or storm surge.

  A typical example of a wave-dissipating block is a tetrapod made of concrete (registered trademark), which has been widely used for revetment. The tetrapod itself is suitable for use in measures against high waves such as tsunami and storm surge. Absent. In order to prevent high waves, it is necessary to stack tetrapods high, but tetrapods must be piled up due to their form, so in order to secure the required height, a large amount of tetrapods and a large installation space are required. Necessary, and the individual tetrapods are not connected, they are simply stacked, so when immersed in seawater at high waves, they are easily moved by buoyancy and tend to collapse.

As countermeasures against high waves such as tsunamis and storm surges, breakwaters are generally constructed, and several tsunami breakwaters have been proposed (Patent Document 1), but the construction requires a great deal of cost and time.
Japanese Patent Laid-Open No. 7-113216

The present invention aims at providing a method of installing the wave dissipating blocks can be easily performed in a relatively narrow installation spaces of installation state is stabilized are connected to each other, stacked required height.

In the invention according to claim 1, a plurality of wave-dissipating blocks formed by connecting a plurality of concrete blocks having an isosceles triangle or equilateral triangle with transverse rods at appropriate intervals in a direction along which the rods run along the coast , And the installation method of the wave-dissipating block arranged in a plurality of rows at appropriate intervals in the direction orthogonal to the rod,
The wave-dissipating block arranged on the most land side is characterized in that the concrete blocks are arranged most densely .

The invention according to claim 2 is the installation method of the wave-dissipating block according to claim 1 , wherein the concrete block is formed by laminating a plurality of concrete plates.

  The concrete block of each of the above inventions is formed by putting a reinforcing bar in a mold and then pouring ready-mixed concrete, or by pouring ready-mixed concrete into a steel frame functioning as a mold. In the former case, it is used with the mold removed, and in the latter case, it is used with the steel frame attached. Therefore, the concrete blocks referred to in the above inventions include both those obtained by removing the mold and those obtained by attaching a steel frame to the outside.

According to the first aspect of the invention, when a high wave hits the wave-dissipating block, a part of the wave hits the concrete block or the rod, and the other part flows in between the concrete blocks. The flow is disturbed by collision, merging, squeezing action, etc., the energy is attenuated, the coastal erosion can be prevented and the damage caused by tsunami and storm surge can be reduced, the concrete block is the whole wave-dissipating block Because it is lighter in weight, it can be produced at the factory, transported to the construction site, connected and assembled with rods, manufacturing costs can be reduced, and the pitch of the concrete block can be easily changed by changing the mounting position on the rod Because each concrete block connected with the rod is integrated and does not move apart, Even if waves or storm surges as immersed in sea water installation state an effect equal and stable child.

In particular , when a tsunami pushes and pulls, many people and things try to be beaten together with seawater, but these are placed on the land side and caught on wave-dissipating blocks where concrete blocks are densely placed, and into the sea together with seawater. Pulling in can be prevented.

According to the second aspect of the present invention, the concrete block is composed of a plurality of concrete plates, so that the concrete plates can be further reduced in weight, so that transportation and assembly are further facilitated.

Hereinafter, wave-dissipating blocks according to embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a perspective view of a wave-dissipating block denoted as a whole by reference numeral 1. The wave-dissipating block 1 is a concrete plate having a regular section with a length a of about 3 m as shown in FIG. A concrete block 3 in which a plurality of 2 are stacked is connected at a constant pitch by three rods 4 made of reinforced concrete.

  The wave-dissipating block 1 of the present embodiment is configured as described above, and when high waves are rushed in the state of being installed on the coast, other seawater collides with part of the seawater bounced off against the concrete block 3 or the rod 4. However, by mixing and entering between the blocks, the flow is disturbed and the wave energy is attenuated, and the erosion of the coast and the riverbank can be prevented. The same form can be maintained even if it is repeated, and the concrete plate 2 is relatively lightweight, so it is easy to manufacture and transport to the factory, and connect and assemble with lot 4 The cost can be reduced, the pitch of the concrete block 3 can be easily changed by shifting the mounting position to the lot 4, and each block 3 can be It is integrally connected by a preparative 4, without the loose motion, that even if, as immersed in sea water at high sea installation state is stabilized, an effect equal.

  FIG. 2 shows an example of the use of the above-described wave-dissipating block 1. A plurality of wave-dissipating blocks 1, three in the illustrated example, are arranged in parallel, and two wave-dissipating blocks 1 that are turned upside down are extinguished. Fit between the wave blocks 1, then place two wave-dissipating blocks 1 on it, and further insert the wave-dissipating block 1 combined in a diamond shape on it to form an equilateral triangle as a whole, the length of one side of the block 3 When a is 3 m, the assembly block 5 having a height of about 7.8 m is formed. In the figure, the arrows indicate the direction of waves or river flow. The same applies to FIG. 4 below.

  The concrete block 3 of the embodiment is configured by stacking a plurality of concrete plates 2, but may be configured by a single concrete block in which a plurality of concrete plates 2 are integrated.

  In another embodiment, the concrete block has the same size as the concrete plate 2 in which one or more concrete blocks are stacked, and is formed by pouring ready-mixed concrete into a steel frame functioning as a formwork. At the time of construction, the steel frame is transported to the site and installed on the coast or river shore in a state where it is connected by the rod 4, or the concrete is poured into the mold after being submerged on the sea or river bottom near the coast. .

  According to the present embodiment, the frame body not filled with concrete is relatively lightweight, so it is relatively easy to produce and transport to the site, connect with the rod and assemble, and reduce the manufacturing cost. After that, even if the steel frame is corroded by being immersed in water or seawater, the exposed concrete block will continue its wave-dissipating function, and the same as in the above embodiment The effect of.

  FIG. 3 shows another example of the wave-dissipating block, which corresponds to the second wave-dissipating block, and is a concrete that forms a rhombus in the form of a regular combination of regular triangles instead of a regular triangular concrete block. Block 7 is used.

4, the wave-dissipating block 1 shown in FIG. 1 is arranged side by side, and the wave-dissipating block 6 shown in FIG. 3 is assembled thereon to form an assembly block 8 similar to the assembly block 5 shown in FIG. Is.
In the assembly block 8 of this embodiment, even if a high wave is received, the individual wave-dissipating blocks 6 are not displaced laterally and do not collapse.

FIG. 5 shows another example of the use of the wave-dissipating block 1. Two types of wave-dissipating blocks 1 having different pitches of the concrete block 3 are arranged along the coastline at a constant interval from the coastline, and the pitch of the concrete block 3 is changed. A dense wave-dissipating block 1 is arranged on the land side.

  According to this embodiment, when a tsunami pushes and pulls, if a person or an object is exposed and tries to be drawn into the sea, it is easy to be caught by the wave-dissipating block 1 arranged on the land side, and is drawn into the sea together with seawater. Can be prevented.

The perspective view of a wave-dissipating block. The side view which shows the usage example which assembled | attached the wave-dissipating block shown in FIG. The perspective view which shows another aspect of a wave-dissipating block. The side view which shows the usage example which assembled | attached the wave-dissipating block shown in FIG.1 and FIG.3. The side view which shows another usage example of the wave-dissipating block shown in FIG.

1, 6 ... Wave-dissipating block 2, 7 ... Concrete plate 3. Concrete block 4. Rod 5, 8 ... Assembly block

Claims (2)

A plurality of wave-dissipating blocks formed by connecting a plurality of concrete blocks having an isosceles triangle or equilateral triangle with a transverse rod at an appropriate interval in a direction along which the rod extends along the coast and in a direction orthogonal to the rod. A method of installing a wave-dissipating block arranged in a plurality of rows at appropriate intervals,
The wave-dissipating block is disposed on the most land side, and the concrete block is arranged most densely. The installation method of the wave-dissipating block according to claim 1 , wherein the concrete block has a form in which a plurality of concrete plates are laminated.

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